Jason Segal and Michelle Williams are Hollywood's cutest new couple.

Pippa Middleton could face prosecution for her involvement in an incident in which a male friend brandished a semiautomatic handgun at a photographer in Paris, according to the Sun. A photo taken by the paparazzo shows Middleton — the sister-in-law of Prince William — grinning in the passenger seat of a convertible as the driver aims the firearm at the camera. Paris police officials are expected to launch an investigation. "If the evidence points to her involvement, she will be prosecuted. Anybody involved in the illegal use of a handgun in public is liable to arrest and interrogation," a source says, adding that if the gun proves to be real, brandishing it in a public place is punishable by up to seven years in prison "for all parties involved." If it was a fake gun, the maximum sentence is two years.

Angelina Jolie and Brad Pitt are now engaged to be married, but what about their earlier claims that they would not tie the knot until everyone in the U.S. — including gays and lesbians — had the same right? Looks like they got tired of waiting. But Rebekah Orr of Equality California still supports the famous couple. "Marriage is something that says, 'We're a family' in a way that nothing else can," she tells TMZ. "No one has to deny that for themselves or their family to prove they are an ally and supporter of equality." Besides Jolie and Pitt have already showed their support several times over, contributing more than $1 million to the fight against California's Proposition 8, which outlawed same-sex marriage in the state.

Jason Segel is lobbying hard for the title of Most Adorable Boyfriend, as the "How I Met Your Mother" apparently tapes photos of girlfriend Michelle Williams to the back of his iPhone case, according to the Daily Mail. Segel was spotted carrying the personalized phone in L.A. this weekend. A photo alone would be sweet, sure, but Segel also has the phrase "I love you" scribbled over and over again around the pictures. "They're much more serious than everyone thinks," a source says. "They're really happy."

Though Emma Roberts and Chord Overstreet supposedly ended their relationship three months ago, the actors have been giving it another go and "have been hanging out," according to Us Weekly. "They're seeing where it goes," a source says. "They liked each other, but fought a lot. They're taking it slowly this time." Taking it slow apparently means hitting church on Easter together as well as a party at the Soho House last week. "They held hands throughout the evening and kissed plenty of times," an eyewitness says of Roberts and Overstreet at the event. "The two were inseparable."

Zac Efron admits that after packing on 18 pounds of muscle to play a Marine in "The Lucky One," he didn't know who was staring back at him from the mirror. "By the end of the movie I didn't recognize myself," Efron tells Men's Health. "You hear about guys like Christian Bale who dive into it and are really able to transform. I've always wondered if I had the willpower to actually do it. And I'll always have pride around the sense that I can." Efron, who's back to his slimmer 145 pounds, says his secret is healthier-than-normal work ethic. "I could pick up almost anything. If you put it in front of me, I could always find a way to tackle it," he says. "I was never a natural at anything, but I could always outwork everybody."

"Glee" co-stars Lea Michele and Cory Monteith took their real-life romance to the Coachella music festival this weekend, according to Us Weekly. Montheith arrived after Michele at a VIP pool party — but reportedly made up for his tardiness with some public displays of affection. "He tapped her on the shoulder and she was so excited to see him, she threw her arms around him and they hugged and kissed on the lips," a source reports, adding that the couple then retreated to a private cabana. "Their arms were constantly around each other and they were talking very close. They definitely looked like a couple with how affectionate they were being in public." Michele wasn't shy about her excitement online, either: "I just saw a really hot 6-foot-3 Canadian with a tribal arm band hanging by the pool," she posted to Twitter when he arrived. "So happy."